By P. D. Evans, V. B. Wigglesworth
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Extra resources for ADVANCES IN INSECT PHYSIOLOGY VOL19 APL, Volume 19
It would be appropriate, however, to mention that as a consequence of Brown’s pioneering work on proctolin, insect preparations have a prominent role to play in developing a better understanding of the physiology of peptidergic systems. It seems likely that future studies on the subcellular mechanisms of action of proctolin will uncover novel cellular transduction mechanisms. In several examples of proctolin action we see evidence for the role of second messengers. Description of precisely how proctolin causes muscle contractions and how it modulates muscle responsiveness to other transmitters may reveal new principles of transmitter action and new mechanisms in the regulation of excitation-contraction coupling in muscle.
By this method, it was observed that a blood germ cell barrier was present in differentiating cysts, whereas younger cysts containing spermatocytes were permeable. The permeability of older cysts varied during the intermoult period and might be linked to changes in the haemolymph ecdysone titre (Marcaillou and Szollosi, 1975). Ecdysterone might therefore intervene in spermatocyte differentiation by modifying cyst permeability to the macromolecular factor or other proteins. It was also shown in vitro in Schistocerca that ecdysterone permitted the formation of a barrier in the testicular follicles (Jones, 1978).
Pharmacologically active constituents of the cockroach corpus cardiacum: Resolution and some characteristics. Gen. Comp. Ednocr. 5,387-401. Brown, B. E. (1967). Neuromuscular transmitter substance in insect visceral muscle. Science 155,595-597. Brown, B. E. (1975). Proctolin: a peptide transmitter candidate in insects. Life Sci. 17,1241-1252. Brown, B. E . (1977). Occurrence of proctolin in six orders of insects. J . Insect Physiol. 23,861-864. Brown, B. E. and Starratt, A. N. (1975). Isolation ofproctolin, a myotropicpeptide, from Periplaneta americana.